文献类型： 外文期刊

作者： Zhang, Xianmei ¹ ; He, Zhenquan ³ ; Jia, Wei ⁴ ; Meng, Fanrong ³ ; Zhang, Wenju ¹ ; Lu, Changai ¹ ; Hao, Xiangyang ⁵ ; Gai, Guosheng ³ ; Huang, Zhaohui ⁵ ; Xu, Minggang ¹ ; Wang, Kaijun ⁷ ; Yun, Sining ⁷ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Key Lab Arable Land Qual Monitoring & Evaluat, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China

3.Tsinghua Univ, Wuxi Res Inst Appl Technol, Wuxi 214100, Peoples R China

4.Minist Agr & Rural Affairs China, Cultivated Land Qual Monitoring & Protect Ctr, 20 Maizidian St, Beijing 100125, Peoples R China

5.China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Engn Res Ctr,Minist Educ Geol Carbon Storage & Low, Beijing 100083, Peoples R China

6.Shanxi Agr Univ, Engineer & Technol Acad Ecol & Environm, Shanxi Prov Key Lab Soil Environm & Nutrient Resou, Taiyuan 030031, Peoples R China

7.Xian Univ Architecture & Technol, Sch Mat Sci & Engn, Funct Mat Lab FML, Xian 710055, Peoples R China

关键词： potassium feldspar powder; mechanochemical activation; water soluble potassium; available potassium; potassium availability

期刊名称：MATERIALS （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 17 卷 1 期

页码：

收录情况： SCI

摘要： To improve the potassium availability of feldspar at ordinary temperatures, the mechanical grinding and addition of sodium hydroxide/salts were employed to study the effects of mechanical activation and strong alkali addition on particle characteristics, water-soluble potassium, and the available potassium of feldspar. A laser particle size analyzer was utilized for the direct determination of particle size distribution (PSD) using ground samples. The Brunauer-Emmett-Teller (BET) method was employed for specific surface areas. X-ray diffraction (XRD) was employed for structural characterization, scanning electron microscopy (SEM) for morphology exploration, and energy dispersive spectroscopy (EDS) to determine the chemical composition of potassium feldspar powder. The results revealed that the mechanical activation of potassium feldspar could reduce the particle size and produce agglomerated nanoparticles in the later period. The addition of NaOH and sodium salt did not cause agglomeration, and NaOH dissolved the nanoparticles. The water-soluble potassium content of feldspar in each treatment increased during mechanical grinding, from 21.64 mg kg-1 to 1495.81 mg center dot kg-1, by adding NaOH 5% weight of potassium feldspar powder and to 3044.08 mg center dot kg-1 by adding NaOH 10% weight with effects different from those of mechanical shaking. By comparison, only 162.93 mg center dot kg-1 water-soluble potassium was obtained by adding NaOH 5% weight. The dissolved potassium in the former case was significantly higher than in the latter, and the addition of NaOH and sodium salts significantly enhanced the water-soluble potassium contents due to ion exchange. Furthermore, the addition of sodium hydroxide improved the water-soluble potassium due to its mechanochemical action on potassium feldspar. The mechanical energy changed the crystal structure of potassium feldspar, explaining the increase in available potassium. The addition of sodium salts did not promote change in the feldspar's structure, thereby did not raise the available potassium content. The reason for this was related to the mechanochemical action on sodium hydroxide and feldspar, which could promote the dissolution of fine particles, thereby incrementing the available potassium.